/Engine/Source/Runtime/Engine/Classes/Animation/AnimCompress.h
Common compression utility to retain only intermittent position keys. For example, calling with an Interval of 3 would keep every third key in the set and discard the rest
static void FilterIntermittentPositionKeys ( struct [FTranslationTrack](API\Runtime\Engine\Animation\FTranslationTrack) & Track, int32 StartIndex, int32 Interval )